Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72928ceac34d312…

MALICIOUS

PDF

101.0 KB Created: 2021-09-03 04:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49525390e1c72e9cca6ef93405b82e30 SHA-1: e029db768a03f6da41208a693138cab1c632fac1 SHA-256: c72928ceac34d31273e61d9b2cd134511400e02fb7fe98853a49db85dfb32aac
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. The presence of a 'Password-Protected Archive Lure' heuristic indicates the document likely instructs the user to obtain a password to decrypt a payload, a common tactic to evade gateway security. The embedded URLs point to compromised WordPress sites and other disposable hosting, suggesting a distribution mechanism for further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d6d3a7b7---86171909499.pdf In PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/88681655460.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/venikolirigegupuzim.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/96324724918.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/52300584905.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/fepubexefo.pdfIn PDF document text
    • https://mmtours.si/uploads/87812250203.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-28/20210628020416241008.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/96262630856.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d603676383e---zutegetanejabuvalo.pdfIn PDF document text
    • http://apsons.eu/files/file/safidoxemanujezetepitege.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/435dc0e36ab170e1cc2d347a1452d745/47354963831.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/duliluvuziso.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210712_ABCE1CC370AF6DAA.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/caa4b62ab0260659d10cbe7156cda65e/82927409221.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/fovawenaluperenixex.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/67566435494.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d6007ce8f00498b02f693e197e6c82e1/fusagufomamazazanuf.pdfIn PDF document text
    • https://aashianarealty.com/file/xugexemenodososi.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/fozidajujotinizezuwiwirib.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/da1840a2c0142292221f43b87b2a5e4c/dixopixomifufiluw.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d5c9f60fe0be2fa4aa9eaae0e0159cac/fekakivavumofowasivubu.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/tikibagupovivizalew.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/votaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gps+tracker+manual+portuguesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB6 20360 bytes
SHA-256: 35d785062b4ff6709448fd07891bc271e73b0521f94d9d9dbf03e17215efb712
font_01_sfnt_off000154c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C0 10856 bytes
SHA-256: adfb53ea476a7e204b0fef3ef8394c08e8a8ed9db388c6f1edc050c09d633ace
font_02_sfnt_off00016de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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